---
import { getLanguageFromURL } from '../../languages';
import { SIDEBAR } from '../../config';
const { currentPage } = Astro.props;
const currentPageMatch = currentPage.slice(1);
const langCode = getLanguageFromURL(currentPage);
// SIDEBAR is a flat array. Group it by sections to properly render.
const sidebarSections = SIDEBAR[langCode].reduce((col, item, i) => {
	// If the first item is not a section header, create a new container section.
	if (i === 0) {
		if (!item.header) {
			const pesudoSection = { text: '' };
			col.push({ ...pesudoSection, children: [] });
		}
	}
	if (item.header) {
		col.push({ ...item, children: [] });
	} else {
		col[col.length - 1].children.push(item);
	}
	return col;
}, []);
---

<nav aria-labelledby="grid-left">
	<ul class="nav-groups">
		{sidebarSections.map((section) => (
			<li>
				<div class="nav-group">
					<h2 class="nav-group-title">{section.text}</h2>
					<ul>
						{section.children.map((child) => (
							<li class="nav-link">
								<a
									href={`${Astro.site.pathname}${child.link}`}
									aria-current={`${currentPageMatch === child.link ? 'page' : 'false'}`}
								>
									{child.text}
								</a>
							</li>
						))}
					</ul>
				</div>
			</li>
		))}
	</ul>
</nav>

<script is:inline>
	window.addEventListener('DOMContentLoaded', (event) => {
		var target = document.querySelector('[aria-current="page"]');
		if (target && target.offsetTop > window.innerHeight - 100) {
			document.querySelector('.nav-groups').scrollTop = target.offsetTop;
		}
	});
</script>

<style>
	nav {
		width: 100%;
		margin-right: 1rem;
	}
	.nav-groups {
		height: 100%;
		padding: 2rem 0;
		overflow-x: visible;
		overflow-y: auto;
		max-height: 100vh;
	}

	.nav-groups > li + li {
		margin-top: 2rem;
	}

	.nav-groups > :first-child {
		padding-top: var(--doc-padding);
	}

	.nav-groups > :last-child {
		padding-bottom: 2rem;
		margin-bottom: var(--theme-navbar-height);
	}

	.nav-group-title {
		font-size: 1rem;
		font-weight: 700;
		padding: 0.1rem 1rem;
		text-transform: uppercase;
		margin-bottom: 0.5rem;
	}

	.nav-link a {
		font-size: 1rem;
		margin: 1px;
		padding: 0.3rem 1rem;
		font: inherit;
		color: inherit;
		text-decoration: none;
		display: block;
	}
	.nav-link a:hover,
	.nav-link a:focus {
		background-color: var(--theme-bg-hover);
	}

	.nav-link a[aria-current='page'] {
		color: var(--theme-text-accent);
		background-color: var(--theme-bg-accent);
		font-weight: 600;
	}

	:global(:root.theme-dark) .nav-link a[aria-current='page'] {
		color: hsla(var(--color-base-white), 100%, 1);
	}

	@media (min-width: 50em) {
		.nav-groups {
			padding: 0;
		}
	}
</style>
